• When the shield is absent, the IMD replies to unauthorized commands, even if the adversary is in a non-line-of-sight location more than 14 m away, and uses a commercial device that operates in the MICS band and adheres to the FCC power limit.

• When the shield is present and has the same transmit power as the adversary, the IMD does not respond to unauthorized commands, even when the adversary is only 20 cm away.

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